Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e11b3307f25abc…

MALICIOUS

PDF

74.7 KB Created: 2021-04-06 03:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 046b328e12f826887156b755af5845d3 SHA-1: c8d76344419881f8b7f09dddcd124d7b006677d5 SHA-256: 41e11b3307f25abc2aac82c205cb3e6b02b6811cf62a8423a6ac14481e188ae6
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that redirects to a suspicious domain, likely serving as a lure for phishing or malware distribution. The document body, though heavily obfuscated, appears to be related to a furnace issue, reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dugedepap.ru/strik?utm_term=why+is+my+furnace+blowing+cold+air+on+heat PDF link annotation
    • https://cdn.sqhk.co/satofurijob/dJqBiir/47102566238.pdfIn PDF document text
    • http://electorat.org/mesojqzhy5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415962/normal_6026199b978f7.pdfIn PDF document text
    • https://cdn.sqhk.co/sotatixorawi/zVAijNT/52205888066.pdfIn PDF document text
    • https://cdn.sqhk.co/potiribuwuf/mmjgjhr/air_traffic_watcher.pdfIn PDF document text
    • https://cdn.sqhk.co/zokelofid/kiiwuS4/43207411085.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/bvVLygg/febalijujotib.pdfIn PDF document text
    • http://buybritishcat.com/778732086677w9o7.pdfIn PDF document text
    • https://cdn.sqhk.co/jidelugob/fjigfgg/15571903895.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421210/normal_604622335b7af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471683/normal_60378708d2e91.pdfIn PDF document text
    • https://cdn.sqhk.co/madozozafi/sgev1g3/13781834729.pdfIn PDF document text
    • https://cdn.sqhk.co/vagekasip/iihehjf/sony_vegas_cut_sound_from_video.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/federal_trade_commission_horizontal_merger_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/wuluduxatatipusefezedup.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/99241433143.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/riello_burner_motor_wiring.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AA 5780 bytes
SHA-256: 459f673749c733f6cd628e41369fa9feb94b18cc09a28398a082bb1c39537559
font_01_sfnt_off0000f94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94A 10876 bytes
SHA-256: c74349dad176c45961205ffdfd4c905087cf3e3f29407767b3b9380cccb19369

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